I decided to have a go at photographing the moon, having noticed it being bright and clear in the sky on my walk home. This is the best I could do leaning out of my window with 400mm lens. I'm pretty sure that the blur that remains is due to the atmosphere in-between as I shooting at f6.3, 1/400s with VR. That or just soft focus! Certainly the lens will focus past infinity and turn the moon into a complete blur so you do need to focus carefully.

It's a 100% crop (at least it is if you click for the fullsize version) so that's as much as my 12.3MP D300 can do in terms of resolution. It's still tiny in the frame even with 400mm lens on a DX sensor!